changed socket.io-parser dependency to version 2.2.1

the socket.io-parser dependency prior to version 2.2.1 had a dependency [component/emitter](https://github.com/component/emitter) using an URL: "http://github.com/component/emitter/archive/1.0.1.tar.gz"

This broke any installation in an secured network (no connection to the internet, using only a local NPM replica)

socket.io-parser in version 2.2.1 or greater describe the [dependency through a NPM package](https://github.com/Automattic/socket.io-parser/blob/2.2.1/package.json#L12)